Sensor Electrode Broadened Portion Suppresses Capacitive Coupling
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Solution Overview
Problem
In sensor-equipped display devices, the close proximity of sensor driving electrodes and lead lines can lead to capacitive coupling, causing error detection by mistakenly registering object contact at incorrect positions due to variations in electrostatic capacitance, especially near the display's periphery.
Innovation Solution
The implementation of a sensor-equipped display device design where detection electrodes have a broadened portion connected to the body portion, positioned in a non-display area outside the display area, preventing capacitive coupling between the sensor driving electrode and the lead line, and ensuring accurate detection by maintaining constant capacitance between the common electrode and detection electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sensor driving electrode and lead line are disposed closely to each other to downsize the display device, then the frame width is reduced, but capacitive coupling occurs between the sensor driving electrode and lead line causing error detection
Solution Approach 1:
A grounded conductive material is introduced as an intermediary between the sensor driving electrode and the lead line. This intermediate layer blocks the capacitive coupling between these two conductors, preventing the lead line from functioning as an erroneous sensor while allowing the frame to remain narrow.
2Length of moving object
If the lead line is positioned close to the sensor driving electrode, then the device size is reduced, but the lead line detects false capacitance variations causing error detection at incorrect positions
Solution Approach 1:
The grounded conductive material serves as a mediator that electrically isolates the lead line from the sensor driving electrode's electric field. This prevents the lead line from detecting false capacitance variations that would otherwise cause erroneous object detection at incorrect positions.
3Area of stationary object
If the detection electrode is extended into the non-display area to improve detection, then detection coverage is increased, but the frame width increases
Solution Approach 1:
The detection function is extracted from the lead line by grounding the conductive material near it. This allows the lead line to be positioned close to the sensor driving electrode without compromising detection accuracy, effectively separating the sensing function from the signal transmission function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses capacitive coupling between the sensor driving electrode and lead lines, reducing error detection and allowing for precise object detection without compromising display quality or increasing the frame width.
Implementation Method 1
the lead line may function as a sensor due to capacitive coupling between the sensor driving electrode and the lead line
Implementation Method 2
The broadened portion is disposed in the non-display area without being overlaid on the display area in planar view
Data Source
AI summary
A sensor device is provided and includes electrodes each including first parts arranged in a first direction and a second part connected to the first parts, the first parts each having a first mesh shape which is formed of first metal wires, and the second part having a second mesh shape which is formed of second metal wires, wherein a longitudinal direction of the second part is the first direction, and at least one of the first mash shape and the second mash shape has an intersection portion at which two of the first metal wires or two of the second metal wires intersect.